m-n | 1 | 2 | 3 | 4 |
0 | 3.832 | 7.016 | 10.173 | 13.324 |
1 | 1.841 | 5.331 | 8.536 | 11.706 |
2 | 3.054 | 6.706 | 9.969 | 13.170 |
3 | 4.201 | 8.015 | 11.346 | 14.580 |
円筒導波管TEモード(Transverse electric mode)
\begin{eqnarray} H_z &=& H_0 J_m(k_r r) \cos(m \phi) \cos(k_z z) \\ k_r &=& k'_{mn}/a \\ \omega^2 &=& c^2 (k_p^2+k_z^2) \\ k_z &=& (\omega^2-c^2 k_p^2)^{1/2} \end{eqnarray} 位相因子を残すと \begin{eqnarray} H_z &=& H_0 \exp{i(\omega t- m \phi- k_z z)} J_m(k_p r) \\ H_r &=& (H_0^2-H_r^2)^{1/2} \end{eqnarray} \begin{eqnarray} D^{(E\pm)} &=& \left[ 1+(p-q) \cfrac{k_\bot k_0}{} \right] \nonumber \\ D^{(B\pm)} &=& \nonumber \\ Q_n &=& J_m (x_{\bot n} R_b) N'_m (x_{\bot n} R_b) - J'_m (x_{\bot n} R_b) N_m (x_{\bot n} R_b) \end{eqnarray} \begin{eqnarray} k_{\parallel n} &=& k_z + n k_0 \label{eq:defkparan} \\ k^2_{\bot n} &=& \cfrac{\omega^2}{c^2}-k^2_{\parallel n} \label{eq:defkbotn} \end{eqnarray} 円筒波型導波管の境界条件、 \begin{eqnarray} 0 &=& E_{t}(r=R_W) \propto E_z + E_t \cfrac{{\rm{d}} R_W}{{\rm{d}}z} \\ 0 &=& E_{\theta}(r=R_W) \end{eqnarray} は、Floquetの定理より、 \begin{eqnarray} 0 &=& \sum^{\infty}_{n=-\infty} \exp ik_n z \left({1+\cfrac{ik_n}{\cfrac{\omega^2}{c^2} - k^2_n} \cfrac{{\rm{d}} R_W}{{\rm{d}}z} } \right) \left[D_n J_m (k_{\bot n} R_W) + E_n N_m (k_{\bot n} R_W) \right] \\ 0 &=& \sum^{\infty}_{n=-\infty} \exp ik_n z \cfrac{\cfrac{\omega}{c} }{ \cfrac{\omega^2}{c^2} - k^2_n } \cfrac{{\rm{d}} R_W}{{\rm{d}}r} \left[D_n J_m (k_{\bot n} R_W) + E_n N_m (k_{\bot n} R_W) \right] \end{eqnarray} よって、 \begin{eqnarray} \left[ \matrix{ D^{(E+)} (\omega, k_{n}) & D^{(E-)}(\omega, k_{n}) \cr D^{(B+)}(\omega, k_{n}) & D^{(B-)}(\omega, k_{n}) } \right] \cdot \left[\matrix{A^{(+)} \cr A^{(-)} }\right] =0 \end{eqnarray} となる。 \begin{eqnarray} D^{(E \pm)}_{\alpha n} (\omega, k_{n}) &=& \left[ 1+\left( n - \alpha \right) \cfrac{k_n k_0}{k_{\bot n}} \right] \left( C^{(J)}_{\alpha n} K^{(1\pm)}_n + C^{(N)}_{\alpha n} K^{(2\pm)}_n \right) -i \cfrac{m \omega}{c k^2_{\bot n}} \left( C^{(J'_m)}_{\alpha n} K^{(3\pm)}_n + C^{(N'_m)}_{\alpha n} K^{(4\pm)}_n \right) \\ D^{(B \pm)}_{\alpha n} (\omega, k_{n}) &=& \cfrac{\omega}{c k_{\bot n}} \left( C^{(J')}_{\alpha n} K^{(1\pm)}_n + C^{(N')}_{\alpha n} K^{(2\pm)}_n \right) - \cfrac{m k_n}{c k^2_{\bot n}} \left( C^{(J_m)}_{\alpha n} K^{(3\pm)}_n + C^{(N_m)}_{\alpha n} K^{(4\pm)}_n \right) \end{eqnarray} ここで、 \begin{eqnarray} C^{(J)}_{\alpha n} &=& \int^{\pi/k_0}_{-\pi/k_0} {\rm{d}}z J_m (k_{\bot n} R_W) \exp [i(n-\alpha) k_0 z] \nonumber \\ C^{(N)}_{\alpha n} &=& \int^{\pi/k_0}_{-\pi/k_0} {\rm{d}}z N_m (k_{\bot n} R_W) \exp [i(n-\alpha) k_0 z] \nonumber \\ C^{(J'_m)}_{\alpha n} &=& \int^{\pi/k_0}_{-\pi/k_0} {\rm{d}}z \cfrac{m}{R_W} \cfrac{{\rm{d}}R_W}{{\rm{d}}z} J_m (k_{\bot n} R_W) \exp [i(n-\alpha) k_0 z] \nonumber \\ C^{(N'_m)}_{\alpha n} &=& \int^{\pi/k_0}_{-\pi/k_0} {\rm{d}}z \cfrac{m}{R_W} \cfrac{{\rm{d}}R_W}{{\rm{d}}z} N_m (k_{\bot n} R_W) \exp [i(n-\alpha) k_0 z] \nonumber \\ C^{(J')}_{\alpha n} &=& \int^{\pi/k_0}_{-\pi/k_0} {\rm{d}}z J'_m (k_{\bot n} R_W) \exp [i(n-\alpha) k_0 z] \nonumber \\ C^{(N')}_{\alpha n} &=& \int^{\pi/k_0}_{-\pi/k_0} {\rm{d}}z N'_m (k_{\bot n} R_W) \exp [i(n-\alpha) k_0 z] \nonumber \\ C^{(J_m)}_{\alpha n} &=& \int^{\pi/k_0}_{-\pi/k_0} {\rm{d}}z \cfrac{m}{R_W} J_m (k_{\bot n} R_W) \exp [i(n-\alpha) k_0 z] \nonumber \\ C^{(N_m)}_{\alpha n} &=& \int^{\pi/k_0}_{-\pi/k_0} {\rm{d}}z \cfrac{m}{R_W} N_m (k_{\bot n} R_W) \exp [i(n-\alpha) k_0 z] \nonumber \\ K^{(1 +)}_{n} &=& \cfrac{1}{Q_n} \left[ J_m (k_{\angle n} R_b) N'_m (k_{\bot n} R_b) - \cfrac{k_{\bot n}}{k_{\angle n}} \left( 1- \cfrac{\omega^2_b}{\gamma^3_0 \omega'^2} \right) J'_m (k_{\angle n} R_b) N_m (k_{\bot n} R_b) \right] \nonumber \\ K^{(2 +)}_{n} &=& - \cfrac{1}{Q_n} \left[ J_m (k_{\angle n} R_b) J'_m (k_{\bot n} R_b) - \cfrac{k_{\bot n}}{k_{\angle n}} \left( 1- \cfrac{\omega^2_b}{\gamma^3_0 \omega'^2} \right) J'_m (k_{\angle n} R_b) J_m (k_{\bot n} R_b) \right] \nonumber \\ K^{(1 -)}_{n} = K^{(3 +)}_{n} &=& \cfrac{1}{Q_n} \cfrac{m}{R_b} \cfrac{ \omega^2_b}{\gamma_0 k_{\bot n} } \cfrac{\left( k_n - \cfrac{\omega v_0}{c^2} \right)}{c\omega' k^2_{\angle n}} J_m (k_{\angle n} R_b) N_m (k_{\bot n} R_b) \nonumber \\ K^{(2 -)}_{n} = K^{(4 +)}_{n} &=& - \cfrac{1}{Q_n} \cfrac{m}{R_b} \cfrac{ \omega^2_b}{\gamma_0 k_{\bot n} } \cfrac{\left( k_n - \cfrac{\omega v_0}{c^2} \right)}{c\omega' k^2_{\angle n}} J_m (k_{\angle n} R_b) J_m (k_{\bot n} R_b) \nonumber \\ K^{(3 -)}_{n} &=& \cfrac{1}{Q_n} \left[ J_m (k_{\angle n} R_b) N'_m (k_{\bot n} R_b) - \cfrac{k_{\bot n}}{k_{\angle n}} J'_m (k_{\angle n} R_b) N_m (k_{\bot n} R_b) \right] \nonumber \\ K^{(4 -)}_{n} &=& \cfrac{1}{Q_n} \left[ J_m (k_{\angle n} R_b) J'_m (k_{\bot n} R_b) - \cfrac{k_{\bot n}}{k_{\angle n}} J'_m (k_{\angle n} R_b) J_m (k_{\bot n} R_b) \right] \end{eqnarray} ここで、$Q_n$は、 \begin{eqnarray} Q_n &=& J_m (k_{\bot n} R_b) N'_m (k_{\bot n} R_b) - J'_m (k_{\bot n} R_b) N_m (k_{\bot n} R_b) \end{eqnarray} である。